The number of electrons in the valence shell of semiconductor is ………

If the temperature of semiconductor is increased, the number of electrons in the valence band will …………

When N-type semiconductor is heated, the …………

In conduction band of solid, there is no electron at room temperature. The solid is ………

In the crystal of pure Ge or Si, each covalent bond consists of ………

A pure semiconductor is …………

For an extrinsic semiconductor, the valency of the donor impurity is ………

In a semiconductor, acceptor impurity is

What are majority carriers in a semiconductor?

When a hole is produced in P-type semiconductor, there is …………